Technology is deemed to be "accessible" if it can be used as effectively by people with disabilities as by those without.
Web accessibility is the approach and practice of designing our web content, services, and online brand with accessible, universal access in mind.
Regardless of impairment, the web can and should be accessible by all. Everyone should be able to comprehend, navigate, interact with, and contribute to the web. Designing for web accessibility takes an empathetic approach to help level the playing field by ensuring our online content is available and usable for all.
Accessibility is abbreviated as the numeronym a11y,
where 11 refers to the number of letters omitted.